Will one bad grade in a summer course ruin my admission chances?

Hi everybody! So all my life, I’ve been advanced in all my subjects and have taken honors and AP courses throughout my last years at high school. I’ve maintained a great GPA, and scored well on the PSAT. However, despite me being able to thrive in my other courses, I’ve never been great at math. I have an IEP, and took algebra 1A and 1B my freshman and sophomore year. I tried to take geometry as a summer course in order to get ahead this year. I maintained a solid B+ throughout the entire duration of the summer course, however, the final was worth 300 points and worth 33% of my final grade, and I didn’t do well on it. It dropped my grade until I was just two percentage points away from passing the class. So now I have a D+ on my transcript for a summer course that I worked my butt off on, and I’m curious to know if this will affect my chances of getting into a CSU or UC. I am a California resident. Thank you!

Also, I will be a junior this year, and have solid EC’s and multiple leadership positions and community service hours.

Geometry is an a-g course requirement for the CSU’s and UC’s so you need to retake the class and get a C or better to fulfill the requirements. If you do not retake the class, your application will not be reviewed.

This is from the CSU/UC a-g course requirement matrix and course validation:

Geometry Exception for UC: The omission of a geometry course cannot be validated by any higher-level coursework. However, the omission of the 1st semester of geometry can be validated by successful completion of the 2nd semester

I have linked the CSU/UC course matrix for your information. Familiarize yourself with the requirements:
http://admission.universityofcalifornia.edu/counselors/files/csu-uc-a-g-comparison-matrix.pdf

You want to replace the D grade, since it will be used in your CSU/UC GPA calculation.

Good Luck.

Thank you, however, I was already planning on re-taking the course. My question was in regards to how it might affect my admission chances.

If you retake the exact course, your D will be replaced by the new grade and it will not affect your GPA and should not adversely impact your admission chances.